clownfish
It's all in the details
I have an Optonica SM-7100 integrated amplifier from 1981 that now seems to make the speakers hum gently and I would like to be able to stop it.
The gentle but noticeable hum persists even when all sources are disconnected. It is unaffected by the volume control and moving the speakers (and cables) around has zero effect. My guess is it's at 50 Hz so sourced from the mains.
No hum from the toroidal transformer in the amp or anywhere else and the amp works perfectly in all other respects.
Is it just an amp issue, maybe something getting fed to the output stages? Any suggestions for resolving this because I'm out of ideas.
The gentle but noticeable hum persists even when all sources are disconnected. It is unaffected by the volume control and moving the speakers (and cables) around has zero effect. My guess is it's at 50 Hz so sourced from the mains.
No hum from the toroidal transformer in the amp or anywhere else and the amp works perfectly in all other respects.
Is it just an amp issue, maybe something getting fed to the output stages? Any suggestions for resolving this because I'm out of ideas.